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A leg up.

If you've just upgraded to Shimano's latest flagship drivetrain, we'd understand why you might be a bit uneasy about springing for a full, dual-leg power setup. Pioneer's Dura-Ace R9100 Single Leg Power Meter Crank Arm lets you quantify the gains in efficiency made by Shimano's crankset redesign, letting you track your physical progress as you progress toward upgrading to a full power meter. Or not. The single-leg approach may not let you parse out the power production nuances of each leg individually, but it does provide a full number in order to chart your total output. For most cyclists, that's more than enough to get a leg up on their goals.

The Single Leg Power Meter is an impressive piece of tech on its own, and since it broadcasts wirelessly with ANT+, chances are good that it's already compatible with your current head unit or wearable. It measures pedaling force, direction, and overall efficiency by monitoring 12 points of rotation at 30-degree intervals across the pedal stroke. At each point, the deflection caused by radial and tangential forces on the crank arm is scanned 16 times to ensure a claimed +/-2% accuracy.

The system's Active Temperature Memory Adjustment feature maintains that accuracy in temperatures ranging from 14 to 122 degrees Fahrenheit, so it stays on point even in extreme conditions. This eliminates the need to freewheel in the middle of a race in order to zero the system, a situation that can cost you precious momentum during a solo effort or make you lose your safe position near the front just as the race hits a climb. The unit also has a waterproof rating of IPX6 and IPX7, so it can handle inclement conditions as well as extreme temperatures.

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Perfect!

Familiarity: I've put it through the wringer

I wanted an affordable power-meter option that worked both indoors on my trainer and outside. I wanted to have consistent power readings. This definitely fit the bill. I loved how easy it was to set up and connect. I've put about a thousand miles on it, and my battery is still going strong. I have compared it's power readings with a Wahoo Kickr gen 1 and a Cycleops Hammer in real time, and in my software after the rides. The readings are consistent and comparable with both of them, so I know I am getting good accurate and consistent readings. For my purposes, I know if I am pushing a set wattage indoors, when I do it outdoors, it's the same. Perfect training tool.

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Watts-Up!

Familiarity: I've put it through the wringer

Really love the Pioneer single sided power meter! Incredibly easy to install and set up... Took less then 10 min to get everything going. I have been using the Pioneer meter with a Garmin 820 for almost a year and I am very pleased. Single sided power meter is light weight and simple. Battery life depends on how much you ride, but I got close to 4(k) miles out of mine. When the battery gets low the meter lets you know by displaying a "battery low" icon on my Garmin... I kept forgetting to change the battery and it lasted for another 3 or 4 rides... so no need to panic when low power meter icon comes on. If you want you can add the second side of the meter later and make your power meter even more accurate! With two sided power meter you can measure the power in each leg, allowing you to learn how to pedal more efficiently. Best part of the single sided meter is the price which is why I went with one side only.